LG C1150 Service Manual page 32

3.6.4 Audio Section
1. Receive audio signal from microphone. C1150 use differential configuration.
2. Send audio signal to speaker. C1150 use differential configuration.
3. This section provides an audio codec with a digital-to-analog converter and an analog-to-
digital converter, a ring tone volume controller, a microphone interface, and multiple
analog input and output channels.
4. It interconnect with external device like main microphone, main receiver, and headset
jack through the AIN1N, AIN1P, AIN2N, AIN2P, AIN3N,AIN3P,AOUT1P,AOUT1N,
OUT2P,AOUT2N,AOUT3P, and AOUT3N port.
• AIN1P,AIN1N : Main microphone positive/negative terminal
• AOUT2P,AOUT2N : Main Speaker positive/negative terminal
• AIN2P,AIN2N : Ear-Mic microphone positive/negative terminal
• AOUT1P,AOUT1N : Ear-Mic speaker positive/negative terminal
AD6537B
GPI
CSFS
Control
CSDI
Serial
CSDO
ASFS
Audio
Serial
ASDI
ASDO
Ring Tone
Volume Controller
Port
Port
Filter/
DAC
SRC
Filter/
ADC
SRC
Figure 3-15. AD6537B AUDIO SECTION
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3. TECHNICAL BRIEF
Analog
Switch
PGA
Analog
Switch
PGA
Analog Adder
Microphone Interface
PGA
Gain Pre-Amp
AIN3P
AIN3N
SPWR
AOUT2P
8Ω
AOUT2N
SGND
AOUT1P
32Ω
AOUT1N
AOUT3P
32Ω
AOUT3N
AIN1P
AIN1N
AIN2P
AIN2N